yeah I have thought of that too, but since the oily thing clearly coming from the carburetor mounts and have poured down to where the cylinder head meets the cylinder I doesnt think it is the oil tube. The spot I am worried about is this http://imageshack.us/a/img651/1796/bildmn.jpg
That also seems to come from the mount but I am really not sure, but seems to far away from the oil tube anyways.